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1.ZnS04 + Cu
2.Al(SO4)3 + H2
3.NaOH +H2
4.ZnSO4 +H2
5.Fe(NO3)2 + Cu
6.Mg(NO3)2 +H2
7.Al2O3 + Fe
8.Ag + Cu(NO3)2
9.Ca(OH)2 + H2